Merge pull request #434 from JIghtuse/master

Add Rook's Guide to C++ (crowdfunded book)

free-programming-books.md

@@ -483,6 +483,7 @@
 * [Data Structures and Algorithms with Object-Oriented Design Patterns in C++](http://www.brpreiss.com/books/opus4/index.html)
 * [The Boost C++ libraries](http://en.highscore.de/cpp/boost)
 * [C++ Cookbook](http://staff.ppu.edu/dkhalid/O'Reilly%20-%20C++%20Cookbook%20(2007).pdf)
+* [The Rook's Guide to C++](http://rooksguide.org/2013/11/26/version-1-0-is-out/) (PDF)
 
 ###Clojure
 * [A Brief Beginner’s Guide To Clojure](http://www.unexpected-vortices.com/clojure/brief-beginners-guide/)